Discussion
Which of the following is not an equatorially trapped wave?
The mountain wave
The Kelvin wave
The mixed Rossby-gravity wave
The equatorial Rossby wave
Answer: A
Mountain waves are generated by flow over topography and are found wherever stable flow crosses a barrier, with no connection to the equatorial waveguide. The other three are members of the family of equatorially trapped solutions derived by Matsuno from the shallow water equations on an equatorial beta plane, all of which decay away from the equator.
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